81023003 has 4 divisors (see below), whose sum is σ = 85789080. Its totient is φ = 76256928.

The previous prime is 81022987. The next prime is 81023009. The reversal of 81023003 is 30032018.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 81023003 - 2⁴ = 81022987 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17), and also a Moran number because the ratio is a prime number: 4766059 = 81023003 / (8 + 1 + 0 + 2 + 3 + 0 + 0 + 3).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81023009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2383013 + ... + 2383046.

It is an arithmetic number, because the mean of its divisors is an integer number (21447270).

Almost surely, 2^81023003 is an apocalyptic number.

81023003 is a deficient number, since it is larger than the sum of its proper divisors (4766077).

81023003 is a wasteful number, since it uses less digits than its factorization.

81023003 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4766076.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 81023003 is about 9001.2778537272. The cubic root of 81023003 is about 432.7158253229.

The spelling of 81023003 in words is "eighty-one million, twenty-three thousand, three".